Bowling pin core



FIG. 1 is a first side elevational view of a bowling pin core showing my new design;

FIG. 2 is a second side elevational view taken from the side opposite to FIG. 1 of the bowling pin core showing my new design;

FIG. 3 is a top plan view of the bowling pin core showing my new design;

FIG. 4 is a bottom plan view of a bowling pin core showing my new design. 

The ornamental design for a bowling pin core, as shown and described. 